Trailer lights,,,, UGH!

Well... the bulb was blown, but that isn't the only problem. I think I have found the problem.... I have multiple connectors to go from a 6 to 4 pin. The 6 pin on the trailer had one terminal that was VERY corroded...despite being only 6 months old. Must be all the rain we have had. I took it apart and cleaned it...but I think I need to get a new one. Worse come to worse... I will geri-rig my magnetic ones on. Hopefully I can fix the lights tomorrow. ugh.